| Parasites can come from a number of sources and it very well could be that the parasite came on a plant, in food, or has been there the entire time and is just now starting to show itself. It is also very possible that this was a parasite issue from the not so distant past which is now experiencing a secondary infection.
The point is, unless someone is highly trained in fish and illnesses in particular, diagnosing a lot of issues is much more of an educated guess than it is a proof-positive disease ID and treatment. That said, the issue you have right now could be quite a few things and so looking at them all would help determine the best course of action which is as broad as possible. So, try not to rule anything out since I think because of human nature, we tend to pick the problem which is the easier one to treat and convince ourselves that we must be right about it. |